package com.wangxuan.config.security.component;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.util.Collection;

/**
 * 权限控制
 * 判断用户角色
 */
@Component
public class CustomUrlDecisionManager implements AccessDecisionManager {
    @Override
    public void decide(Authentication authentication, Object o, Collection<ConfigAttribute> configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {
        for (ConfigAttribute configAttribute : configAttributes){
            // 当前url所需角色
            String needRole = configAttribute.getAttribute();
            //判断角色是否登录即可访问的角色，此角色在CustomFilter中设置，
            // 为什么 在for 循环里面怕你判断是否登录
            if("ROLE_LOGIN".equals(needRole)){
                //判断是否登录
                if(authentication instanceof AnonymousAuthenticationToken){
                    throw  new AccessDeniedException("未登录，请登录");
                }else {
                    return;
                }
            }
            // 判断用户角色是否为url所需要角色
            Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
            for (GrantedAuthority authority : authorities){
                if(authentication.getAuthorities().equals(needRole)){
                    return;
                }
                throw new AccessDeniedException("权限不足,请联系管理员");
            }
        }
    }

    @Override
    public boolean supports(ConfigAttribute configAttribute) {
        return true;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return true;
    }
}
